XML 66 R56.htm IDEA: XBRL DOCUMENT
v3.26.1

Net Loss Per Share Attributable to Common Stockholders - Schedule of Diluted Net Loss Per Share Attributable to Common Stockholders (Details) - shares | 3 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025
Schedule of Diluted Net Loss Per Share Attributable to Common Stockholders [Line Items] |  |
Antidilutive net loss per share attributable to common stockholders | 15,687,151 | 2,706,212
Outstanding and issued common stock options [Member] |  |
Schedule of Diluted Net Loss Per Share Attributable to Common Stockholders [Line Items] |  |
Antidilutive net loss per share attributable to common stockholders | 2,671,358 | 2,186,226
Outstanding and issued restricted stock units [Member] |  |
Schedule of Diluted Net Loss Per Share Attributable to Common Stockholders [Line Items] |  |
Antidilutive net loss per share attributable to common stockholders | 170,100 |
Shares issuable upon exercise of Public Warrants [Member] |  |
Schedule of Diluted Net Loss Per Share Attributable to Common Stockholders [Line Items] |  |
Antidilutive net loss per share attributable to common stockholders | 499,986 | 499,986
Shares issuable upon exercise of Common Warrants [Member] |  |
Schedule of Diluted Net Loss Per Share Attributable to Common Stockholders [Line Items] |  |
Antidilutive net loss per share attributable to common stockholders | 12,345,707 |
Unvested performance-based restricted stock units [Member] |  |
Schedule of Diluted Net Loss Per Share Attributable to Common Stockholders [Line Items] |  |
Antidilutive net loss per share attributable to common stockholders |  | 20,000

X
- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
Name: | us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
Name: | us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis=us-gaap_StockOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis=jspr_SharesIssuableUponExerciseOfPublicWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis=us-gaap_WarrantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis=us-gaap_PerformanceSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |